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Morioka, Atsuhiko; Sato, Satoshi; Kinno, Masaharu*; Sakasai, Akira; Hori, Junichi*; Ochiai, Kentaro; Yamauchi, Michinori*; Nishitani, Takeo; Kaminaga, Atsushi; Masaki, Kei; et al.
Journal of Nuclear Materials, 329-333(2), p.1619 - 1623, 2004/08
Times Cited Count：10 Percentile：55.72(Materials Science, Multidisciplinary)The neutron penetration and the activation characteristics of the boron-doped low activation concrete were investigated for irradiation of 2.45 and 14 MeV neutrons. The shielding property of the 2 wt% boron-doped low activation concrete is superior to that of the 1 wt% boron for the thermal neutron, on the contrary to the no clear difference for the fast neutron. The total activity detected in the boron-doped low activation concrete was about one hundredth of that in the geostandard sample at more than 30 days cooling time. The total activity of the boron-doped concrete by major nuclei does not depend on the boron density for the 14 MeV neutron irradiation.
Sato, Satoshi; Morioka, Atsuhiko; Kinno, Masaharu*; Ochiai, Kentaro; Hori, Junichi; Nishitani, Takeo
Journal of Nuclear Science and Technology, 41(Suppl.4), p.66 - 69, 2004/03
no abstracts in English
Matsuda, Norihiro; Nakashima, Hiroshi; Kasugai, Yoshimi; Sasamoto, Nobuo*; Kinno, Masaharu*; Kitami, Takayuki; Ichimura, Takahito; Hori, Junichi*; Ochiai, Kentaro; Nishitani, Takeo
Journal of Nuclear Science and Technology, 41(Suppl.4), p.74 - 77, 2004/03
In high power proton accelerator facilities, concrete shield can be highly activated, which makes maintenance work quite difficult. So, a low-activationized concrete (limestone concrete) is to be partially adopted as a concrete shield for Japan Proton Accelerator Research Complex (J-PARC) aiming at reducing 
-ray exposure dose during maintenance period. A new quantity, 
Na-equivalent, was introduced as a criterion to assure effectiveness of the low-activationized concrete. In order of its verification, powdered low-activationized concrete and ordinary one were irradiated using FNS at JAERI. The measurements were analyzed by a shielding design code system being used for J-PARC, showing that the calculations reproduce the measured induced activity within a factor of 2. Furthermore, by using the same code system, -ray exposure dose was calculated for the configuration of J-PARC to find out that -ray exposure dose by the low-activationized concrete was about 10 times lower than that by the ordinary concrete in a period of less than a few days after operation.
Sasamoto, Nobuo; *; *; *; *; *; Kinno, Masaharu*; Sakamoto, Yukio; Sakurai, Kiyoshi; *; et al.
JAERI-M 89-122, 74 Pages, 1989/09
no abstracts in English
Katayama, Atsushi; Ishimori, Kenichiro; Kameo, Yutaka; Suzuki, Takashi; Matsuzaki, Hiroyuki*; Kimura, Kenichi*; Kinno, Masaharu*; Amano, Hikaru; Nakashima, Mikio
no journal, ,
no abstracts in English
I AMS analysis; Application to radioactive waste and irradiated rocks samplesKatayama, Atsushi; Ishimori, Kenichiro; Kameo, Yutaka; Suzuki, Takashi; Kinno, Masaharu*; Kimura, Kenichi*; Matsuzaki, Hiroyuki*; Nakashima, Mikio
no journal, ,
no abstracts in English
C and 
Cl in activated rock samplesIshimori, Kenichiro; Katayama, Atsushi; Kameo, Yutaka; Haraga, Tomoko; Kimura, Kenichi*; Kinno, Masaharu*; Nakashima, Mikio; Takahashi, Kuniaki
no journal, ,
no abstracts in English
Ca in activated concreteKameo, Yutaka; Katayama, Atsushi; Haraga, Tomoko; Kimura, Kenichi*; Kinno, Masaharu*; Nakashima, Mikio; Takahashi, Kuniaki
no journal, ,
no abstracts in English
